Historical tsunamis · Apr 11, 2012, 10:43 AM UTC
2012 Off W. Coast of N Sumatra tsunami
Indonesia
The tsunami of Apr 11, 2012, 10:43 AM UTC originated near Off W. Coast of N Sumatra (Indonesia).
Key facts
- Date
- Apr 11, 2012, 10:43 AM UTC
- Cause
- Earthquake
- Magnitude
- M8.2
- Depth
- 25 km
- Maximum documented water height
- —
- Observation records
- 4
- Countries affected
- 4
It was triggered by a magnitude 8.2 earthquake at a depth of 25 km.
4 observation sites in 4 countries are recorded.
Outside the source country, the earliest documented arrival was at D23327 Bpr, Bay of Bengal (India) after 0:48 h.
Map of observation sites
4Each dot is a documented observation site; colour and size show the observed water height. The triangle marks the source.
Tsunami arrival times
Documented arrival times from the NOAA/NCEI database, showing the earliest recorded location per country. Coverage is incomplete: a country without an entry was not necessarily spared.
- 0:00 hEarthquake (origin) · Apr 11, 2012, 10:43 AM UTC
- 0:48 hIndia · D23327 Bpr, Bay of Bengal · 0.03 m
- 1:27 hThailand · D23401 Bpr, 600 Nm W-NW of Phuket · 0.04 m
- 1:58 hIndonesia · Enggano Island · 0.22 m
- 3:32 hMaldives · Hanimaadhoo, Haa Dhaalu · 0.18 m
4 places with a documented arrival time
Observations by country
| Country | Observation records | Maximum documented water height | Deaths | Earliest arrival |
|---|---|---|---|---|
| Indonesia | 1 | 0.22 m Enggano Island | — | 1:58 h |
 Maldives | 1 | 0.18 m Hanimaadhoo, Haa Dhaalu | — | 3:32 h |
 Thailand | 1 | 0.04 m D23401 Bpr, 600 Nm W-NW of Phuket | — | 1:27 h |
 India | 1 | 0.03 m D23327 Bpr, Bay of Bengal | — | 0:48 h |
Highest documented water heights
4 / 4Individual documented observations for this event. Heights come from different measurement types and sources; not every location has a measured height.
| Location / station | Observed height | Distance from source | Country |
|---|---|---|---|
| Enggano Island · Bengkulu | 0.22 m | 1,300 km | Indonesia |
| Hanimaadhoo, Haa Dhaalu | 0.18 m | 2,242 km | Maldives |
| D23401 Bpr, 600 Nm W-NW of Phuket | 0.04 m | 996 km | Thailand |
| D23327 Bpr, Bay of Bengal | 0.03 m | 728 km | India |
More tsunamis
Source: NOAA National Centers for Environmental Information (NCEI), Global Historical Tsunami Database. Confirmed events only. Deaths and damage are database estimates; older records are incomplete. Water heights come from different types of observation.